subclasses detect

Hello

In the laser game tutorial by Stephan B Wessels I was intrerested by this
code:

directionFor: aSymbol 
        ^ self subclasses
                detect: [:cls | cls directionSymbol = aSymbol]

The code appears here at the bottom of the page:
http://squeak.preeminent.org/tut2007/html/038.html 

What I read this code as doing, in this example is: return an symbol object
which is a sublass instance varable, if it is the same as aSymbol.

What would happen if more than one subclass object had a match?

Also how else can subclasses detect: be used? It looks very interesting.

Grunt

 
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